How to remove a Office 365 group or distribution group with PowerShell
Delete a Office 365 group via the admin centre
BrowseGo to https://admin.microsoft.com - Select from Teams & Groups -> Active Teams and Groups on the left.
Select the team you wish to delete -> press delete
Delete a Office 365 group via the Exchange Control Panel
Select groups and delete the Office 365 group.
Login via PowerShell in Azure AD
Open Powershell as administrator
Install the PowerShell module from Azure AD
Run the following line in PowerShell:
install-package -Name AzureAD
Connect to AzureAD via PowerShell
Retrieve all deleted Office 365 groups
With this command you can retrieve all Office 365 groups:
Delete a Office 365 Group with Powershell - hard delete
Copy the ID after the get command and place ddit after -ID as in the screenshot below.
Remove-AzureADMSDeletedDirectoryObject -Id 199e5c7....'